CN107860749A - Based on CO2The portable SF of laser6Leak remote sensing instrument - Google Patents

Based on CO2The portable SF of laser6Leak remote sensing instrument Download PDF

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Publication number
CN107860749A
CN107860749A CN201711068231.6A CN201711068231A CN107860749A CN 107860749 A CN107860749 A CN 107860749A CN 201711068231 A CN201711068231 A CN 201711068231A CN 107860749 A CN107860749 A CN 107860749A
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China
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laser
wavelength
portable
signal
leak
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季文海
宋迪
李国林
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China University of Petroleum East China
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China University of Petroleum East China
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Priority to CN201711068231.6A priority Critical patent/CN107860749A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

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  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention belongs to safe gas detection technique field, more particularly to a kind of portable SF6 leakage methods of telemetering based on absorption spectrum, including the Small-sized C O controlled by MCU2Laser, wavelength conditioner, modem, collimation lens, chopper, return laser beam collection system.Return laser beam reception system includes plus lens, optical filter and detector.This portable SF6The leakage method of telemetering overcomes the limitation of fixed leakage telemetering equipment, realizes free remote measurement, for current state-of-the-art SF6Telemetry.To realize free remote measurement, tuned using dual wavelength, avoid using reference path, reduce device volume, it is easy to accomplish portable or even hand-held.Its quantitative measurment, avoid the artificial cognition of imaging quasi-instrument, it is easy to accomplish the automation of measurement process.

Description

Based on CO2The portable SF of laser6Leak remote sensing instrument
Technical field
The invention belongs to SF6Gas detection technology field, more particularly to one kind are based on CO2The portable SF of laser6Leakage Remote measurement identification device.
Background technology
SF6As a new generation's insulation and arc extinguishing gases medium, it is widely used in various power equipments, but SF6Electrically set It is standby usually to be leaked because gas occurs for the reasons such as product quality, component ageing and damage.SF6Gas leakage can trigger Accident, cause electrical equipment to operate, influence the reliability and personal security of equipment；SF6Gas belongs to a kind of greenhouse gases, Generation SF6Leakage can pollute and destroy atmospheric environment, increase greenhouse effects.From environmental protection, ensure power grid security, guarantee work Any angle analysis of personnel's health, SF6Leakage inspection all seems extremely important.
It is applied to detection electrical equipment SF at present6The analysis method of leakage mainly has using the portable of electrochemical sensor Leak detector, NDIR technologies, infrared leak detection imager and laser detecting method, laser detecting method again include technique of laser imaging and Laser telemetry technology.In different detection methods, the electrochemical sensor of contact or the NDIR technologies of pump suction type only survey office The concentration information in portion, the short life of electrochemical sensor, wide spectrum reaction, serious interference；Being imaged class leakage detector needs manually Operation, manual identified, does not provide quantitative measurement results, can not realize real-time online measuring, and multiple gases are reacted, and interference is tight Weight；And laser telemetry method therein be because it can realize remote measurement, detectivity is high and has broad application prospects.
SF is detected using laser telemetry6, only fixed remote sensing instrument at present.Fixed remote sensing instrument is set in front of detection target Reflector is put, reflector can make the laser major part backtracking of incidence, and the reception device near laser can connect The light largely reflected is received, improves detecting distance and accuracy of detection.Auxiliary mark-reflector also limit sharp simultaneously The route of transmission of light, can not free remote measurement.
The content of the invention
The present invention is in order to make up the deficiencies in the prior art, there is provided a kind of to use CO based on spectral absorption2Laser is carried out The portable SF of remote measurement6Leak detection system.
In order to achieve the above object, the technical solution adopted by the present invention is：A kind of portable SF based on spectral absorption6Leakage Telemetry system, including MCU, MCU connection wavelength conditioners and ADC, the wavelength conditioner right are laser, described to swash Light device coaxial direction is provided with collimation lens, chopper and detection target.The laser received down device, the reception device Including condenser lens, optical filter and detector, the detector connects ADC.
Preferably：
The laser selects small carbon dioxide laser, and selection can send the high-power of 10.3-10.8 mum wavelengths CO2Laser.
Control wavelength conditioner regulation CO2Laser sends the laser of different wave length, and a kind of wavelength is as wavelength is measured, separately A kind of wavelength is as reference wavelength.
The detector selection can detect the detector of wavelength near 10.6 μm.
The collimation lens selects non-spherical lens.
The reception device includes receiving lens, optical filter and signal sensor, and wherein receiving lens are Large Aperture Lenses, More preferred, the Large Aperture Lenses are infrared Fresnel Lenses.
The optical filter selects 10.6 μm of narrow band pass filters.
The chopper is to CO2The laser intensity of laser is modulated, while provides reference signal for demodulator.
Beneficial effects of the present invention are：
(1) free remote measurement is realized
Small-sized C O is selected in the system2Laser, the volume of instrument is greatly reduced, it is convenient hand-held.Wavelength conditioner By setting the angle of temperature or grating, CO is controlled2Laser sends the laser of different wave length, and a kind of wavelength is as measurement ripple Long λM, SF6Highly sensitive absorption under this wavelength condition be present；Another wavelength is as reference wavelength λR, SF6In this wavelength Under the conditions of be not present absorb.The propagation path of two kinds of wavelength is identical, eliminates scattering on propagation path, reflection etc. and SF6Nothing The nonabsorbable loss of light, instead of traditional way for being separately provided reference path, saves space, reduce instrument size, Make instrument more portable, it is possible to achieve free remote measurement.
(2) detecting distance is remote
Because CO2The collimation of laser is good, and power is big, operating distance length.So it can be measured in open space, inspection Can be accomplished by surveying scope by nearly 200 meters.This point is all more remote than the distance of infrared imaging and technique of laser imaging.
(3) measurement process automates
Laser telemetry is quantitative measurment, quantifies the degree of leakage.Measurement data can be transmitted and exchanged, and be easy to concentrate tube Reason.Leakage for generation is alarmed at once, and takes venting practice, emergency repair.Automaticity is high.
(4) measurement result is more of overall importance
Laser telemeter is integral concentration of the measurement on hundreds of meters of paths of open space, has reacted the whole structure of leakage And degree, eliminate in several monitoring point advancing equipment sample detectings.
Brief description of the drawings
Fig. 1 is the portable SF based on spectral absorption of the present invention6Leak detecting device systematic schematic diagram.
In figure：1 wavelength conditioner, 2 CO2Laser, 3 MCU, 4 ADC, 5 collimation lenses, 6 amplification demodulators, 7 copped waves Device, 8 SF6Detector, 9 optical filters, 10 condenser lenses, 11 detection targets.
Fig. 2 is SF in embodiment6Absorption line.
Fig. 3 is CO in embodiment2The spectral line of emission of laser.
Fig. 4 is CO in this implementation2The timing diagram of the transmission power of laser different wave length.
Fig. 5 is the receiving power timing diagram of the reflection laser for the different wave length that reception device receives in this implementation.
Embodiment
Below, the present invention is specifically described by exemplary embodiment.It should be appreciated, however, that do not entering one In the case of step narration, element, structure and features in an embodiment can also be advantageously incorporated into other embodiment In.
In the description of the invention, it is necessary to which explanation, term " interior ", " outer ", " on ", " under ", "front", "rear" etc. indicate Orientation or position relationship be based on position relationship shown in the drawings, be for only for ease of the description present invention and simplify description, and It is not instruction or implies signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore It is not considered as limiting the invention.
The present embodiment based on CO2The portable SF of laser6Leakage remote measurement instrument system includes CO2Laser 2, as excellent Choosing, the CO2Laser 2 is Small-sized C O2Laser, can send the laser of 10.3-10.8 mum wavelengths, and the front of laser 2 connects Wavelength conditioner 1.A kind of scheme of wavelength regulation is, by MCU 3 by different temperature setting signals to wavelength conditioner 1, By adjusting CO2The temperature of laser 2 allows laser to change between 10.3 μm -10.8 μm.Select λMAnd λRTwo wavelength, λMWavelength is as SF6The measurement wavelength of detection, λRAs reference wavelength.Preferably, λM=10.53 μm, 10.55 μm, 10.57 μm,10.59μm,10.61μm；λR=10.46 μm, 10.48 μm, 10.50 μm.Two kinds of wavelength are adjacent, are easy to quickly tune, also make The power of laser is more stable.The propagation path of the laser of two kinds of wavelength is identical, eliminates the interference of part background, avoids simultaneously The mode of reference path is separately provided, the volume of instrument is reduced while adds the reliability of detection.In CO2Laser 2 Front be placed with collimation lens 5.Chopper 7 is coaxially arranged with the front of collimation lens 5, chopper 7 makes CO here2Laser The continuous light that device 2 is sent is modulated into the square pulse light of hundreds of hertz of repetitive rate by motor, so as to suppress background stray light Interference and the 1/f noise of detector, while produce ginseng of the reference voltage square wave synchronous with modulating frequency as amplification demodulator 6 Signal is examined, this kind of chopper 7 belongs to existing device, has been applied to Photoelectric Detection, photoelectric sensing, remote sensing and measuring system.It is right Repeated no more here in the structure and principle of chopper 7, belong to prior art.
It is wherein above-mentioned：
CO2Laser 1：For producing the measurement laser of different wave length；
Wavelength conditioner 2：For controlling CO2The radiation wavelength of laser；
MCU 3:For the signal transmitted to the control signal of wavelength conditioner 2 and reception ADC 4；
Collimation lens 5：For caused laser to be collimated；
Chopper 7：For the continuous ray laser for producing output to be modulated into the light with fixed frequency, while export modulation Frequency；
Reception device in this example includes receiving lens 10, optical filter 9 and detector 8.CO2Swash caused by laser 2 Light is got to after the collimation of collimation lens 5 in detection target 11, and detection target 11 is reflected the laser of incidence, some light Incide on condenser lens 10, during which generate absorbing phenomenon.The light received is focused by condenser lens 10, as excellent Choosing, receiving lens selection can pass through the Fresnel Lenses of infrared light.Laser after focusing passes through optical filter 9, has filtered out background Got to after light on the SF6 detectors 8 coaxial with condenser lens 10 and optical filter 9.SF6 detectors 8 receive laser and had Amplification demodulator 6 is passed to signal.Amplify the modulating frequency of the reception chopper 7 of demodulator 6 as reference signal, while to warp Modulated signal after ovennodulation is amplified demodulation, is first amplified modulated signal, then low in high-frequency signal by being modulated at Frequency optical signal is reduced, and the primary signal with the time realizes amplification by amplifier.By the amplification solution for amplifying demodulator 6 Adjust, it is suppressed that influence of the low-frequency noise to original optical signal, while the adverse effect of signal drift is reduced, while also to useful Signal has carried out exchange amplification, realizes the detection of small-signal.In the instrument of reality, chopper 7 and amplification demodulator 6 are common Use, the distance and acuity of detection can be increased.Optical signal after demodulation enters in ADC 4, and ADC 4 is to the signal that receives Analog-to-digital conversion is carried out, the digital data transmission after conversion is to MCU 3.
It is wherein above-mentioned：
ADC 4：MCU 3 is transferred to for receiving demodulated signal caused by amplification demodulator 6 and carrying out analog-to-digital conversion；
Amplify demodulator 6：For receiving SF6The output signal of detector is simultaneously amplified demodulation to reception signal and connect The original amplification optical signal received；Suppress noise and drift simultaneously, realize the detection of small-signal.
SF6 detectors 8：For the laser after collectiong focusing and produce useful signal；
Optical filter 9：10.5 microns of centre wavelength, bandwidth 200-300nm, can only pass through CO2Flashlight (the measurement sent With reference wavelength), wiping out background light；
Condenser lens 10：Collect echo scattering light；
In this embodiment, it is selected as preferable Small-sized C O2Sent by the effect of wavelength conditioner two kinds of laser The laser of different wave length, wavelength XMLaser as measurement SF6Measurement light, choose λMThe SF in Fig. 26Absorption bands, together When be also CO2The radiation wavelength option (Fig. 3) of laser；Wavelength XRLaser as SF6Reference light book during measurement, select Fig. 2 Middle SF6Non-absorbing wave band, while be also CO2The radiation wavelength option (Fig. 3) of laser.CO2It is λ that laser 2, which sends wavelength,M's During laser, power when getting to space after collimation lens 5 and chopper 7 is P1.Be tuned to wavelength XRWhen, power P2。P1 And P2It is designated as emergent power (Fig. 4).
As no SF6During leakage, the SF of RESONANCE ABSORPTION is not caused on laser beam propagation path6Gas.Wavelength is λMLaser Collimated after sending by collimation lens 5, chopper 7 is modulated, and is got in detection target 11, and part returns to receiving lens 10, passes through The wiping out background light of optical filter 9, detector 8 receive optical signal, are converted by amplifying demodulator 6 and ADC 4, obtain power P1’。 Reference wavelength λRLaser propagation approach with measurement wavelength XMLaser propagation approach it is identical, obtain power P2' (such as Fig. 5 dotted lines institute Show), the light of two kinds of wavelength eliminates reflection loss, laser light scattering, optical system because route of transmission is identical, and does not all absorb The loss of the nonabsorbables such as collection efficiency of uniting.And because two wavelength are adjacent, nonabsorbable loss coefficient b is the same, A is re-introduced into, is defined asIt is the transmission power ratio of two wavelength, this is than during whole laser use Keep constant.The system change of luminous power can be offset by introducing it, eliminate use environment temperature, driving current and system are old The influence of change.
SF be present as shown in figure 5, working as6Leakage when, wavelength λMLaser by propagating across SF6Air mass generates suction Receive, the power received becomes for P1", and compared to power P when not absorbing1', P1" compare P1' reduction reflect SF6It is right The absorption of laser.In Figure 5, the SF of various concentrations is corresponded to respectively6The change for the power that receiving terminal receives during leakage, C1, C2, C3 represents different concentration, concentration relationship C1<C2<C3, when concentration is bigger, wavelength λMLaser reflection return after receive The power P arrived1" smaller, wavelength λRLaser reflection return after the power P that receives2" be basically unchanged.The change of power embodies SF6Absorption to laser.The absorption of laser can be obtained by langbobier law, according to the primary law of Bill youth, P1"=P1′ Exp (- A), wherein A=KcL, A are absorbances, K be absorption coefficient it with the property of absorbing material and the wavelength X of incident lightMHave Close, c is the concentration of extinction material, and L is absorption light path.C is SF in the present embodiment6Concentration, L is detection twice of distance. In embodiment, λMFixed, K understands that cL is integral concentration, as treats measured value.Reference wavelength λRLaser received after propagation Power be changed into P2", but because SF6It is λ to wavelengthRLaser do not absorb, so P2"=P2’.In actual use, P2" and P1" obtained by measuring.Variable d is re-introduced into, is defined asBecause Further push away,In use, can be with Pass through and measure the light intensity values of two passages and obtain d values, it is known that K and a, then SF6Integral concentration cL can be obtained by formula.
One kind of embodiment described above, simply more preferably embodiment of the invention, those skilled in the art The usual variations and alternatives that member is carried out in the range of technical solution of the present invention should all include within the scope of the present invention.

Claims (9)

1. one kind is based on CO2The portable SF of laser6Leak remote sensing instrument, it is characterised in that:
Connect MCU wavelength conditioner and ADC；
The wavelength conditioner right is laser；
The laser coaxial direction is provided with collimation lens, chopper；
It is reception device below the laser；
The reception device includes condenser lens, optical filter and detector；
The detector connection amplification demodulator, reconnects ADC；
The laser of the specific wavelength of the laser transmitting is got in detection target by collimation lens and chopper to be reflected, and is reflected The laser returned is received by receiving lens, gets to detector by optical filter, detector demodulates the laser detected by amplifying Device is converted to electric signal and is transmitted to ADC and MCU, and gas detection signals are handled by MCU, judges whether that gas is let out Leakage；
The specific wavelength is two kinds of SF6 absorbing wavelengths and non-absorbing wavelength.
2. the portable SF according to claim 1 based on spectral absorption6Leak telemetering equipment, it is characterised in that:
The laser selects small carbon dioxide laser, and selection can send the CO of 10.3-10.8 mum wavelengths2Laser.
3. the portable SF according to claim 1 based on spectral absorption6Leak telemetering equipment, it is characterised in that:
The wavelength conditioner adjusts CO2Laser sends the laser of two kinds of wavelength successively, and a kind of wavelength is as wavelength is measured, separately A kind of wavelength is as reference wavelength.
4. the portable SF according to claim 1 based on spectral absorption6Leak telemetering equipment, it is characterised in that:It is described to connect Receiving apparatus includes：
Receiving lens, optical filter and signal sensor, optical filter is at receiving lens rear, the adjacent optical filter of signal sensor, Optical filter rear.
5. reception device according to claim 4, it is characterised in that:
The receiving lens are Large Aperture Lenses, more preferred, the Large Aperture Lenses are infrared Fresnel Lenses；The filter Mating plate selects the narrow band pass filter of 10.6 μm of centre wavelength.
6. the portable SF6 leakage telemetering equipments according to claim 1 based on spectral absorption, it is characterised in that:
The chopper is by CO2The continuous light modulation of laser is into the alternation light of square wave, while the signal of identical frequency is put to described Big demodulator is as reference signal.
7. the portable SF based on spectral absorption according to claim 1 and 66Leak telemetering equipment, it is characterised in that:
The amplification demodulator is used for the output signal of pick-up probe and is amplified demodulation to reception signal and is received Original amplification optical signal.
8. the portable SF based on spectral absorption according to claim 1 and 76Leak telemetering equipment, it is characterised in that:
Produce demodulated signal using amplification demodulator and carry out analog-to-digital conversion and be transferred to MCU.
9. the portable SF based on spectral absorption according to claim 1 and 86Leak telemetering equipment, it is characterised in that:
The wavelength conditioner is controlled by MCU.
CN201711068231.6A 2017-11-03 2017-11-03 Based on CO2The portable SF of laser6Leak remote sensing instrument Pending CN107860749A (en)

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CN201711068231.6A CN107860749A (en) 2017-11-03 2017-11-03 Based on CO2The portable SF of laser6Leak remote sensing instrument

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108562551A (en) * 2018-04-11 2018-09-21 黑龙江工程学院 A kind of method that detector accurately measures concentration of SO 2 gas
CN108760653A (en) * 2018-04-11 2018-11-06 黑龙江工程学院 A kind of method that spectrometer accurately measures concentration of SO 2 gas
CN109239001A (en) * 2018-09-17 2019-01-18 中国科学院武汉物理与数学研究所 Motor-vehicle tail-gas residual quantity absorbs optical filtering Imaging remote sensing monitoring device and method
CN114527103A (en) * 2022-02-15 2022-05-24 南京浦光芯片科技有限公司 Fluorescent gas detection device based on dual wavelength

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108562551A (en) * 2018-04-11 2018-09-21 黑龙江工程学院 A kind of method that detector accurately measures concentration of SO 2 gas
CN108760653A (en) * 2018-04-11 2018-11-06 黑龙江工程学院 A kind of method that spectrometer accurately measures concentration of SO 2 gas
CN109239001A (en) * 2018-09-17 2019-01-18 中国科学院武汉物理与数学研究所 Motor-vehicle tail-gas residual quantity absorbs optical filtering Imaging remote sensing monitoring device and method
CN109239001B (en) * 2018-09-17 2020-11-03 中国科学院武汉物理与数学研究所 Remote sensing monitoring device and method for absorption, filtering and imaging of tail gas difference of motor vehicle
CN114527103A (en) * 2022-02-15 2022-05-24 南京浦光芯片科技有限公司 Fluorescent gas detection device based on dual wavelength

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Application publication date: 20180330